Reverse biased PN junction p n p n Reverse biased PN junction energy diagram.

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Presentation transcript:

Reverse biased PN junction p n p n

Reverse biased PN junction energy diagram

Voltage-dependent capacitor

Example 5.5 Consider a gallium arsenide PN junction at room temperature. Determine the junction capacitance with a reverse bias voltage of 5 V.

Example 5.5 Consider a gallium arsenide PN junction at room temperature. Determine the junction capacitance with a reverse bias voltage of 5 V.

Forward biased PN junction p n -+

Basic model – thermal equilibrium p n +-

Reverse biased PN junction energy diagram

Forward biased PN junction

Schottky barrier junction

Schottky barrier junction Energy levels before joining

Schottky barrier junction Thermal equilibrium - electrons depart leaving a region of ions – Fermi energies lineup

Schottky barrier junction Reverse bias conditions

Schottky barrier junction Forward bias conditions

Characteristics of a Schottky diode and a PN junction diode

Example 5.7 A silicon PN junction is forward biased at room temperature. Determine the voltage that is required to induce a particular diode current.

You think that you had a bad day.

Simple three-dimensional unit cell